27661307 has 4 divisors (see below), whose sum is σ = 27735840. Its totient is φ = 27586776.

The previous prime is 27661303. The next prime is 27661313. The reversal of 27661307 is 70316672.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27661307 - 2² = 27661303 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27661301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36707 + ... + 37452.

It is an arithmetic number, because the mean of its divisors is an integer number (6933960).

Almost surely, 2^27661307 is an apocalyptic number.

27661307 is a deficient number, since it is larger than the sum of its proper divisors (74533).

27661307 is an equidigital number, since it uses as much as digits as its factorization.

27661307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74532.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 27661307 is about 5259.4017720650. The cubic root of 27661307 is about 302.4295562582.

Adding to 27661307 its reverse (70316672), we get a palindrome (97977979).

The spelling of 27661307 in words is "twenty-seven million, six hundred sixty-one thousand, three hundred seven".